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Université de Fribourg

Species delimitation in the East Asian species of the relict tree genus Zelkova (Ulmaceae): A complex history of diversification and admixture among species

Naciri, Yamama ; Christe, Camille ; Bétrisey, Sébastien ; Song, Yi-Gang ; Deng, Min ; Garfì, Giuseppe ; Kozlowski, Gregor

In: Molecular Phylogenetics and Evolution, 2019, vol. 134, p. 172–185

Zelkova species, trees of the elm family (Ulmaceae), are part of the Cenozoic relict flora. In western Eurasia, the genus comprises three species that are restricted to disjunct areas (Z. sicula on Sicily, Z. abelicea on Crete and Z. carpinifolia in Transcaucasia). The situation is different in East Asia, where three species (Z. serrata, Z. schneideriana and Z. sinica) have at least partly...

Université de Fribourg

Hybridization as a threat in climate relict Nuphar pumila (Nymphaeaceae)

Arrigo, Nils ; Bétrisey, Sébastien ; Graf, Larissa ; Bilat, Julia ; Gerber, Emanuel ; Kozlowski, Gregor

In: Biodiversity and Conservation, 2016, vol. 25, no. 10, p. 1863–1877

Field studies and conceptual work on hybridization-mediated extinction risk in climate relicts are extremely rare. Nuphar pumila (Nymphaeaceae) is one of the most emblematic climate relicts in Europe with few isolated populations in the Alpine arc. The extent of introgression with related lowland and generalist species Nupharlutea has never been studied using molecular methods. All...

Université de Fribourg

Morphological differentiation of leaves in the relict tree Zelkova carpinifolia (Ulmaceae)

Jasińska, Anna K. ; Rucińska, Beata ; Kozlowski, Gregor ; Bétrisey, Sébastien ; Safarov, Hajiaga ; Boratyńska, Krystyna ; Boratyński, Adam

In: Dendrobiology, 2016, vol. 74, p. 109–122

Zelkova carpinifolia is a relict tree occurring in refugial zones of south-western Eurasia. The main aim of the study was the biometrical comparison of the leaf characteristics of the species sampled in three regions of Transcaucasia. We aimed to test the hypotheses that (1) leaves from vegetative (L) shoots would be larger and more variable than those from fertile (S) shoots, (2) the leaves...

Université de Fribourg

Fighting their last stand? A global analysis of the distribution and conservation status of gymnosperms

Fragnière, Yann ; Bétrisey, Sébastien ; Cardinaux, Léonard ; Stoffel, Markus ; Kozlowski, Gregor

In: Journal of Biogeography, 2015, vol. 42, no. 5, p. 809–820

Aim: Gymnosperms are often described as a marginal and threatened group, members of which tend to be out-competed by angiosperms and which therefore preferentially persist at higher latitudes and elevations. The aim of our synthesis was to test these statements by investigating the global latitudinal and elevational distribution of gymnosperms, as well as their conservation status, using all...

Université de Fribourg

Hydrophobia of gymnosperms: myth or reality? A global analysis

Kozlowski, Gregor ; Stoffel, Markus ; Bétrisey, Sébastien ; Cardinaux, Léonard ; Mota, Matteo

In: Ecohydrology, 2014, p. –

According to the classical textbooks, the gymnosperms are the only seed plants without aquatic species. Recently, however, a set of virtually complete compilations on gymnosperms has been published, enabling a new evaluation of the putative hydrophobia of gymnosperms. This synthesis aims at portraying the relation of all extant gymnosperm species to aquatic and wetland habitats. We present a...

Université de Fribourg

Footprints of past intensive diversification and structuring in the genus Zelkova (Ulmaceae) in south-western Eurasia

Christe, Camille ; Kozlowski, Gregor ; Frey, David ; Bétrisey, Sébastien ; Maharramova, Elmira ; Garfì, Giuseppe ; Pirintsos, Stergios ; Naciri, Yamama

In: Journal of Biogeography, 2014, p. -

Aim: To elucidate the phylogeographical patterns in three Cenozoic relict species: Zelkova sicula, Z. abelicea and Z. carpinifolia (Ulmaceae).Location: Sicily, Crete and Transcaucasia.Methods: Two chloroplast loci (trnH–psbA and trnL) and the nuclear ribosomal markers ITS1 and ITS2 were sequenced for 154 samples collected from 14 populations of Z. abelicea, 16 populations of Z. carpinifolia,...

Université de Fribourg

Some like it cold: distribution, ecology and phylogeny of Arenaria bernensis Favarger (Caryophyllaceae) from the western Prealps in Switzerland

Berthouzoz, Marjorie ; Maendly, Simon ; Bétrisey, Sébastien ; Mangili, Sofia ; Prunier, Patrice ; Lexer, Christian ; Kozlowski, Gregor

In: Alpine Botany, 2013, vol. 123, no. 2, p. 65–75

Arenaria bernensis (Caryophyllaceae), traditionally placed within the Arenaria ciliata aggregate and discovered only in 1955, is a poorly studied endemic taxon of western Prealps in Switzerland. In this study, we aimed to deliver the first detailed appraisal on morphology, distribution and ecology of A. bernensis accompanied by first molecular insights into the A. ciliata aggregate using...